PHPA mud - Schlumberger Oilfield Glossary
A class of water muds that use partially-hydrolyzed polyacrylamide (PHPA) as a functional additive, either to control wellbore shales or to extend bentonite clay in a low-solids mud.As a shale-control mud, PHPA is believed to seal microfractures and coat shale surfaces with a film that retards dispersion and disintegration. KCl is used as a shale inhibitor in most PHPA mud designs.
Baroid IDP's QUIK-TROL® GOLD PAC Polymer Demonstration - Duration: 2:26. Baroid Industrial Drilling Products (IDP) 5,132 views
Field Applications of PHPA Muds CONTROL DRILLING SOLIDS
If shaker blinding occurs with the PHPA mud in such circumstances, use a shearing device while pre-hydrating the PHPA or switch to the next-coarser screen size. Watch for tight hole resulting from gauge hole or drill cuttings adhering to the wellbore when drilling with PHPA muds.
For the cutting dispersion test, three formulations of water based drilling fluid with different concentrations of PHPA (A, B and C) have been prepared , this test has allowed to know the effectiveness of PHPA to mitigate the cutting dispersion by the encapsulation mechanism. All concentrations of following products have been optimized for mud properties of drilling the intermediate hole section:
Drilling Fluids Archives - AMC Drilling Optimisation
AMC EZEE BORE™. AMC EZEE BORE™ is an easy to mix, one-sack drilling fluid system that provides excellent rheological and filtration control properties and is ideally suited for use in horizontal directional drilling, water well, mining and tunnelling applications.
Drilling Fluid Technology: Performances and Environmental Considerations 229 1. The WBM family, in which fresh-, salt-, or sea-water is the continuous phase, is the most used (90-95%). The WBM are mainly composed of aqueous solutions of polymers and clays in water or brines, with different types of additives incorporated to the aqueous solution.
Rheology - Drilling Fluids - Netwas Group Oil
Drilling fluids with elevated viscosity at high shear rates tend to exhibit greater retention of mud on cuttings and reduce the efficiency of high-shear devices like shale shakers [Lundie]. Conversely, elevated viscosity at low shear rates reduces the efficiency of low-shear devices like centrifuges, inasmuch as particle settling velocity and separation efficiency are inversely proportional to viscosity.
PHPA (partially hydrolyzed polyacrylamides) polymers encapsulate (wrap up) clay and shale, preventing them from reacting with water. To determine if a clay/shale is contaminating the drilling fluid, a full mud test may be needed to get the full aspect of the effects the drilled solids are having on the fluid properties.
Rheological Properties of PHPA Polymer Support Fluids
In addition, the presence of NaOH, Na 2 CO 3 , xanthan gum, the dissolution of the PHPA solids and perhaps some contaminants in the mud might have contributed to increasing the YP of the PHPA
Although Partially hydrolyzed polyacrylamide (PHPA) can be used to control filtration of drilling fluid, the primary function of PHPA is used to viscosify the drilling fluid and encapsulate the shale particles, i.e. shale encapsulation and thickening (viscosifier) function in drilling mud (O’Brien and Chenevert, 1973, Chen et al., 2003
Effects of Polymers and CMC Concentration on Rheological
To successfully drill through the hydrates, the drilling fluid should have low mud invasion, exhibit optimum properties for wellbore stability, prevent the formation of the hydrates in the annulus
Liquid drilling fluid is often called drilling mud. The three main categories of drilling fluids are: water-based muds, which can be dispersed and non-dispersed; non-aqueous muds usually oil-based; gaseous drilling mud in which a wide range of gases can be used; Drilling Mud is classified based on their fluid phase, alkalinity, dispersion and
- Can polyacrylamide aqueous dispersion be soluble after polymerization?
- However, after polymerization, the resulting copolymer should not be soluble in the dispersion medium. The first non-ionic monomer used in aqueous media was acrylamide, which can be copolymerized with anionic and cationic monomers to produce an ionic polyacrylamide aqueous dispersion system .
- Which dispersion medium is used for cationic polyacrylamide aqueous polymerization?
- Initially, most researchers utilized ammonium sulfate as the dispersion medium for polymerization. Zheng et al . prepared a stable cationic polyacrylamide aqueous dispersion using poly (2-methylacryloylxyethyl trimethylammonium chloride) (DMC) as the dispersion stabilizer and potassium persulfate-sodium sulfite as the initiator.
- Can acrylamide based polymers be used in aqueous dispersions?
- Paper manufacture, mining, and water treatment processes also benefit from the use of acrylamide-based polymers to flocculate solids in aqueous dispersions.
- What is the molecular weight of a polyacrylamide dispersed system?
- The resulting polyacrylamide dispersed system exhibited a molecular weight of up to 1.05 × 10 7 g·mol −1, indicating significant stability. Zhao et al . utilized dispersion polymerization to synthesize polyacrylamide, employing an aqueous solution of ammonium sulfate and sodium chloride as inorganic salts.
